What the hell is someone who DOESN'T know rough ratios for sine of common angles, doing taking good money off someone to fly an airplane?
Applications?
Drift, enroute and in the hold
Headwind and crosswind components
Effect of bank angle on climb performance/load factor S&L
Propellor theory
etc
Maybe we have found the reason that pay and conditions are slipping in this profession. Instead of getting the top half of the class that understand what their aeroplane is doing, we are getting dimwits that think maths and aeroplanes dont mix (er... hello?) need to punch 2+2 into calculators to get an answer and whinge about how hard the (multiple choice!) ATPL exams are to pass.
Young people these days.....